Light source apparatus, image display apparatus and control method for light source apparatus

Abstract

A light source apparatus includes: a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors; a setting unit configured to seta drive mode; and a control unit configured to drive the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, by a drive method corresponding to the drive mode set by the setting unit, wherein in a case where the light-emitting unit is lit with a predetermined light emission brightness, in a light-emitting diode from among the plurality of light-emitting diodes, a drive current value during a lighting period is lower and a lighting period during one cycle is longer in a second drive mode than those in a first drive mode.

What is claimed is: 
     
       1. A light source apparatus, comprising:
 a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors; 
 at least one processor; and 
 at least one memory storing a program which, when executed by the at least one processor, causes the light source apparatus to: 
 drive the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, wherein 
 the plurality of light-emitting diodes include a G-LED which is a light-emitting diode that emits green light and a specified-color LED which is a light-emitting diode that emits light different from green light; and 
 in a case where white light is emitted from the light-emitting unit, the current supplied to the G-LED in the lighting period of the G-LED is lower than the current supplied to the specified-color LED in the lighting period of the specified-color LED, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer than the lighting period of the specified-color LED in one cycle of light emission of the specified-color LED. 
 
     
     
       2. The light source apparatus according to  claim 1 , wherein
 the specified-color LED is a B-LED which is a light-emitting diode that emits blue light. 
 
     
     
       3. The light source apparatus according to  claim 1 , wherein
 the specified-color LED is an R-LED which is a light-emitting diode that emits red light. 
 
     
     
       4. The light source apparatus according to  claim 3 , wherein
 the plurality of light-emitting diodes further include a B-LED which is a light-emitting diode that emits blue light. 
 
     
     
       5. The light source apparatus according to  claim 4 , wherein
 the light-emitting unit is driven such that in a case where white light is emitted from the light-emitting unit, the current supplied to the G-LED in the lighting period of the G-LED is lower than the current supplied to the B-LED in the lighting period of the B-LED, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer than the lighting period of the B-LED in one cycle of light emission of the B-LED. 
 
     
     
       6. The light source apparatus according to  claim 4 , wherein
 the light-emitting unit is driven such that in a case where white light is emitted from the light-emitting unit, the current supplied to the B-LED in the lighting period of the B-LED is lower than the current supplied to the R-LED in the lighting period of the R-LED, and the lighting period of the B-LED in one cycle of light emission of the B-LED is longer than the lighting period of the R-LED in one cycle of light emission of the R-LED. 
 
     
     
       7. The light source apparatus according to  claim 4 , wherein
 the light-emitting unit is driven such that in a case where white light is emitted from the light-emitting unit, the lighting period of the B-LED in one cycle of light emission of the B-LED is longer than the lighting period of the G-LED in one cycle of light emission of the G-LED. 
 
     
     
       8. The light source apparatus according to  claim 1 , wherein
 the light-emitting unit has the plurality of light-emitting diodes respectively for a plurality of partial regions in a region of a light-emitting surface of the light-emitting unit; and 
 the light-emitting unit is driven such that the light emission brightness and the light emission color of the light-emitting unit substantially coincide between the plurality of partial regions. 
 
     
     
       9. The light source apparatus according to  claim 1 , wherein
 the light-emitting unit is driven such that in a predetermined drive mode, the current supplied to the G-LED in the lighting period of the G-LED is lower than the current supplied to the specified-color LED in the lighting period of the specified-color LED, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer than the lighting period of the specified-color LED in one cycle of light emission of the specified-color LED, 
 in a drive mode different from the predetermined drive mode, driving of the light-emitting unit, which is different from the driving of the light-emitting unit in the predetermined mode, is performed. 
 
     
     
       10. The light source apparatus according to  claim 1 , wherein the G-LED is a gallium nitride type semiconductor LED. 
     
     
       11. The light source apparatus according to  claim 1 , wherein light emission efficiency of the G-LED is lower than light emission efficiency of other light-emitting diodes included in the plurality of light-emitting diodes. 
     
     
       12. The light source apparatus according to  claim 1 , wherein
 for improving power efficiency, the light-emitting unit is driven such that in a case where white light is emitted from the light-emitting unit, the current supplied to the G-LED in the lighting period of the G-LED is lower than the current supplied to the specified-color LED in the lighting period of the specified-color LED, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer than the lighting period of the specified-color LED in one cycle of light emission of the specified-color LED. 
 
     
     
       13. The light source apparatus according to  claim 1 , wherein
 for improving power efficiency and suppressing acceleration of deterioration over time of the specified-color LED, the light-emitting unit is driven such that in a case where white light is emitted from the light-emitting unit, the current supplied to the G-LED in the lighting period of the G-LED is lower than the current supplied to the specified-color LED in the lighting period of the specified-color LED, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer than the lighting period of the specified-color LED in one cycle of light emission of the specified-color LED. 
 
     
     
       14. The light source apparatus according to  claim 2 , wherein the B-LED is a gallium nitride type semiconductor LED. 
     
     
       15. The light source apparatus according to  claim 2 , wherein deterioration over time of the B-LED is faster than deterioration over time of the G-LED. 
     
     
       16. The light source apparatus according to  claim 3 , wherein the R-LED is an indium-gallium-aluminum-phosphorous type semiconductor LED. 
     
     
       17. The light source apparatus according to  claim 1 , wherein the light emission brightness of the light-emitting unit can be changed by adjusting at least one of a pulse width and a pulse amplitude of a pulse signal of a current that is supplied to the light-emitting diode. 
     
     
       18. An image display apparatus, comprising:
 a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors; 
 a display panel for displaying an image on a screen by modulating light from the light-emitting unit on the basis of input image data; 
 at least one processor; and 
 at least one memory storing a program which, when executed by the at least one processor, causes the light source apparatus to: 
 drive the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, wherein 
 the plurality of light-emitting diodes include a G-LED which is a light-emitting diode that emits green light and a specified-color LED which is a light-emitting diode that emits light different from green light; and 
 in a case where a white image is displayed on the screen, the current supplied to the G-LED in the lighting period of the G-LED is lower than the current supplied to the specified-color LED in the lighting period of the specified-color LED, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer than the lighting period of the specified-color LED in one cycle of light emission of the specified-color LED. 
 
     
     
       19. A control method executed by at least one processor of a light source apparatus including a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors, the control method comprising:
 driving the light-emitting unit; and 
 periodically emitting light from each of the plurality of light-emitting diodes by the driving, wherein 
 the plurality of light-emitting diodes include a G-LED which is a light-emitting diode that emits green light and a specified-color LED which is a light-emitting diode that emits light different from green light; and 
 in a case where white light is emitted from the light-emitting unit, the current supplied to the G-LED in the lighting period of the G-LED is lower than the current supplied to the specified-color LED in the lighting period of the specified-color LED, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer than the lighting period of the specified-color LED in one cycle of light emission of the specified-color LED. 
 
     
     
       20. A control method executed by at least one processor of an image display apparatus including a light-emitting unit having a plurality of light-emitting diodes having mutually different light emission colors, and a display panel for displaying an image on a screen by modulating light from the light-emitting unit on the basis of input image data, the control method comprising:
 acquiring the input image data; and 
 driving the light-emitting unit in such that each of the plurality of light-emitting diodes emits light periodically, wherein 
 the plurality of light-emitting diodes include a G-LED which is a light-emitting diode that emits green light and a specified-color LED which is a light-emitting diode that emits light different from green light; and 
 in a case where a white image is displayed on the screen, the current supplied to the G-LED in the lighting period of the G-LED is lower than the current supplied to the specified-color LED in the lighting period of the specified-color LED, and the lighting period of the G-LED in one cycle of light emission of the G-LED is longer than the lighting period of the specified-color LED in one cycle of light emission of the specified-color LED.